Finally it has been released for iPhone, iPod Touch, and iPad alike. You can get it form iTunes. No word yet on jailbreaking, although, it was reported that the Geohot’s exploit was working up to 4.2 beta 3. As of now I am updating my iPhone 4 and will report back if limera1n is working with final release of 4.2.1.
Update: I’m not sure why it says 4.2 on the update, and is actually 4.2.1. Way to confuse people Apple.
Below you can see the changelog, my favorite feature is the ability to find text in safari!